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Cell phone video is never as good as one’s ears, so I can’t really tell you what I hear. A couple of classic problems would be a coil lamination hitting the flywheel or an improperly fastened gas tank and/or support ring. If you remove the flywheel and apply Magic Marker to the face of the coil laminations, then run again and inspect, you can see if the coils have been rubbing. I wouldn’t really be automatically aghast at 60 psi. When the engine is at its lowest possible idle speed, where does the mag control lever point to? On a very good running three, it will actually point to “idle,” and not half way to “start.”
Long live American manufacturing!